I have the Squash Fuel system. I put a pressure sensor on my fuel rail and use that signal to one of the analog inputs to my SCT device. I datalog through that.
Setting up the transfer formula was a PITA, but after that all is good.

I have AGP dual pump setup w/ return. FPCM is still plugged in. Fuel pump power wires are unplugged of course. I have not messed with the fpcm at all.

My question is, should I still be seeing fuel pressure through hptuners or other software? I do get the code p023f and understand what it is and that it wont go away until i unplug the fpcm. But if i can at least get some idea of what my FP is then i dont mind the CEL being on. I just dont get a reading for fuel pressure, bounces around 0.

I have AGP dual pump setup w/ return. FPCM is still plugged in. Fuel pump power wires are unplugged of course. I have not messed with the fpcm at all.

My question is, should I still be seeing fuel pressure through hptuners or other software? I do get the code p023f and understand what it is and that it wont go away until i unplug the fpcm. But if i can at least get some idea of what my FP is then i dont mind the CEL being on. I just dont get a reading for fuel pressure, bounces around 0.

You can retain the FPCM with a return system. I did this successfully a couple of weeks ago on my own ZL1. HPTuners has a beta version of software now that allows access to the FPCM calibration. With this, you can change settings in the module. I am even using the FPCM to run the primary pump at 99% duty cycle and using a pressure sensor and relay to run the secondary pump. I have the fuel pressure sensor hooked up and I am able to monitor the pressure through a scanner.

You can retain the FPCM with a return system. I did this successfully a couple of weeks ago on my own ZL1. HPTuners has a beta version of software now that allows access to the FPCM calibration. With this, you can change settings in the module. I am even using the FPCM to run the primary pump at 99% duty cycle and using a pressure sensor and relay to run the secondary pump. I have the fuel pressure sensor hooked up and I am able to monitor the pressure through a scanner.

So i should be able to see pressure still? Like i said, i still have it hooked up but the old pump power wires are disconnected causing the code. not sure if the code is causing pressure to read 0 or if something else needs to be done to get the stock fp sensor to turn back on.

So we have a factory fuel pump controller running 2 e85 pumps with a regulator with a return set to 72psi at full voltage and no boost reference working flawlessly on e85 and 850 rwhp and the fuel pressure sensor is still working since we have an OEM FPCM

So we have a factory fuel pump controller running 2 e85 pumps with a regulator with a return set to 72psi at full voltage and no boost reference working flawlessly on e85 and 850 rwhp and the fuel pressure sensor is still working since we have an OEM FPCM

So we have a factory fuel pump controller running 2 e85 pumps with a regulator with a return set to 72psi at full voltage and no boost reference working flawlessly on e85 and 850 rwhp and the fuel pressure sensor is still working since we have an OEM FPCM

That is awesome. I am doing this with a lower regulator pressure setting. Nice to know it is being done by someone else. I was being told it can't be done...had me worried.

So we have a factory fuel pump controller running 2 e85 pumps with a regulator with a return set to 72psi at full voltage and no boost reference working flawlessly on e85 and 850 rwhp and the fuel pressure sensor is still working since we have an OEM FPCM

I must have done something done something to my fuel pressure sensor/wiring then during install. Mine doesnt want to work anymore.